Subj : USB locking up
To   : Ky Moffet
From : Barry Martin
Date : Tue Sep 29 2020 07:55:00


Hi Ky!

 KM> Quickie before I forget... how much plugging and unplugging have
 KM> all these USB ports seen? design lifespan is ~1000 uses. Daily
 KM> for 3 years would exceed that. Wondering if there might be a
 KM> broken trace that usually (but not always) shorts when the port
 KM> gets wiggled. And any wiggling the system could trigger it, even
 KM> if using a different port, just cuz it takes very little at the
 KM> micro level of traces.

 KM> There's another reason to use disposables like hubs and short
 KM> extension cables, rather than repeatedly using the ports on the
 KM> much-more-costly mainboard (whether convenient or not). Or at
 KM> least stick to ports that are not directly attached to the
 KM> motherboard.

 KM> I got some one foot extensions from Jacobsparts (ebay) precisely
 KM> for this purpose. Also makes stupidly-arranged ones easier to
 KM> reach.

 KM> This'un: (5 pack so about two bucks each)

 KM> https://www.ebay.com/itm/5-pack-USB-3-0-Extension-Cable-Cord-Stand
 KM> ard-Type-Male
 KM> Female-1-FT-5X-/141688424701?hash=item20fd49c8fd

 KM> Good quality, arrived fast, best price, and they carry all sorts
 KM> of weird lengths not usually seen.

The USB ports are all 'essentially new': irregular usage so a little
hard to guess.  Maybe six times one day and then none for the next couple
of weeks.  And I've had it lock up via (powered) USB Hubs -- plugged in 
to the rear panel.  So doesn't appear to be a broken trace/sticky-out 
wire problem, though I had thought of that some time back.

BTW did work on a little project yesterday where I needed to plug in a
thumbdrive -- got my logger going, no lock ups!  ...Maybe should run the 
logger all the time!



 
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